KIST realizes large-area high-efficiency organic solar cell… Achieved over 14% light activation efficiency

A Korean research team is one step closer to realizing a large-area, high-efficiency organic solar cell. A large-area, high-efficiency organic solar cell was realized by identifying the main performance reduction factors in the module large-area process and developing a ternary combination of photoactive layer semiconductor materials.

The Korea Institute of Science and Technology (KIST, President Yoon Seok-jin) announced on the 27th that Dr. Son-Jeong Son’s team at the Center for Next-Generation Solar Cell Research has achieved such a result.

Organic solar cells are drawing attention as a core technology for urban photovoltaic power generation because they can be produced by printing on building walls, roof exterior materials, and windows. However, high-efficiency organic solar cells are still small, less than 0.1 cm2, developed at the laboratory level. These unit devices must be connected in series and modularized, but performance reduction and reproducibility problems remain as commercialization challenges.

The research team paid attention to the form of a photoactive layer that generates power by receiving light in an organic solar cell. The photoactive layer is generally composed of p-type and n-type semiconductor materials. The p-type semiconductor has more holes than electrons, acting as charge carriers, whereas the n-type semiconductor has more electrons.

During the solvent evaporation process during the photoactive layer formation process, aggregation of p-type semiconductors (p-type polymers) occurs, reducing battery efficiency. The research team was the first to find out that when an n-type polymer that can interact with a p-type polymer is added to form a photoactive layer, they form a composite in the form of an alloy, and the p-type polymer can be controlled over a large area very regularly. . In this way, it has been found that a ternary photoactive layer (a photoactive layer composed of three types of components) can be uniformly implemented from nanometers (㎛) to centimeters. The research team achieved the world’s highest level of 14.04% photoelectric conversion efficiency in an area of ​​58.5 cm2 using the ternary photoactive layer.

Dr. Son Seon-jeong said, “We are one step closer to the commercialization of organic solar cells by revealing the major factors that decrease performance when large-scale modularization of organic solar cells produced by the printing process. Through this, we want to proceed with follow-up R&D until the stage of application to exterior walls of buildings or automobiles.”

This research was carried out with the support of the Ministry of Science and ICT (Minister Jong-ho Lee) as a major project of KIST, as well as a material innovation leading project and a nano-future material source technology development project. Top 0.92%) in the field” was published online.

By Kim Young-jun, staff reporter [email protected]

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